private bool TryGetDiagramConnectorViewModel(ModelRelationshipId modelRelationshipId, out DiagramConnectorViewModel viewModel) => _diagramConnectorToViewModelMap.TryGet(modelRelationshipId, out viewModel);
private bool TryGetDiagramConnectorViewModel(IDiagramConnector diagramConnector, out DiagramConnectorViewModel viewModel) => _diagramConnectorToViewModelMap.TryGet(diagramConnector, out viewModel);